[Elecraft] K2 T4 winding ratio

[Don Wilhelm]

  Sorry again.

Reading my own email, I discovered a problem.
The standard winding ratio is the ONLY one to be used with the KSB2 
option installed.  The "increased efficency at 5 watts" ratio is only 
for CW and at power levels of 5 watts or less.  The efficiency at 
greater power levels is less than using the standard ratio.

73,
Don W3FPR

On 3/15/2011 11:02 PM, Don Wilhelm wrote:
>    Hi and sorry about the bandwidth.
>
> I recall receiving a query about the T4 alternate winding ratio within
> the past week, but cannot locate the email to respond properly.
>
> The normal winding ratio for T4 is to be used.  It must NOT be used if
> the KSB2 option is installed.
>
> In other words, it can only be used with a CW only, QRP only (at 5 watts
> or less) type K2.
>
> While the alternate QRP winding of T4 may produce greater efficiency at
> the 5 watt level, if used at levels above 5 watts, the efficiency is
> actually reduced.
>
> In other words, I do not recommend that the alternate ratio for T4 be
> installed on any K2.  I have seen several that have this modification
> that have been sold, and the buyer adds the KSB2, then wonders why the
> K2 "acts funny in transmit" when used for SSB.
>
> If the original person asking this question has any more questions,
> please contact me off-list.
>
> 73,
> Don W3FPR
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